exam Maths Puzzle Numerical Ability

How do you write 10.9 in Roman Numerals? I know how to write the 10, but am unsure of how the decimals are done.

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exam Other Question

please help me solve this equation: {{{2=1/x^2-1/1+1/x-1}}} A jar contains 13 black and 12 red marbles. If one marble is drawn at random, what is the probability that it is black?